iOS 15.1真机Sign in with Apple模态视图关闭动画异常如何修复

该异常是iOS 15.0 ~ 15.1版本系统自带的Bug，属于AuthenticationServices框架的适配问题，和开发者的业务代码实现逻辑无关，苹果官方已经在iOS 15.2及后续系统版本中修复了该问题。你测试到其他接入该功能的App也存在相同表现，也验证了这是系统层面的共性问题。

模拟器上表现正常是因为模拟器的系统渲染逻辑和真机存在差异，该异常只会在iOS 15.0~15.1的真机上出现。

方案1：版本适配（推荐） #

直接对系统版本做判断，仅在iOS 15.2及以上版本使用原生SignInWithAppleButton，低于该版本的用户可以引导升级系统，或者降级使用自定义Apple登录按钮触发授权流程，该方案不会被苹果审核驳回。

方案2：修改现有布局（适配iOS15.0/15.1） #

你当前代码中给承载按钮的VStack添加了ignoresSafeArea(.all)修饰符，是触发该系统Bug的常见诱因，可以做如下调整：

• 移除全局ignoresSafeArea(.all)修饰符，替换为仅对需要忽略安全区的视图单独添加，或者仅忽略指定边缘的安全区，比如ignoresSafeArea(.container, edges: .bottom)。
• 如果必须要全局忽略安全区，可以使用UIKit的ASAuthorizationAppleIDButton包装成SwiftUI视图使用，规避SwiftUI原生组件的适配问题，参考代码如下：

import SwiftUI
import AuthenticationServices

struct AppleSignInButtonWrapper: UIViewRepresentable {
    typealias UIViewType = ASAuthorizationAppleIDButton
    var onRequest: (ASAuthorizationAppleIDRequest) -> Void
    var onCompletion: (Result<ASAuthorization, Error>) -> Void
    
    func makeUIView(context: Context) -> ASAuthorizationAppleIDButton {
        let button = ASAuthorizationAppleIDButton(type: .signIn, style: .black)
        button.addTarget(context.coordinator, action: #selector(Coordinator.tapAction), for: .touchUpInside)
        return button
    }
    
    func updateUIView(_ uiView: ASAuthorizationAppleIDButton, context: Context) {}
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
    
    class Coordinator: NSObject, ASAuthorizationControllerDelegate, ASAuthorizationControllerPresentationContextProviding {
        let parent: AppleSignInButtonWrapper
        init(_ parent: AppleSignInButtonWrapper) {
            self.parent = parent
        }
        
        @objc func tapAction() {
            let request = ASAuthorizationAppleIDProvider().createRequest()
            parent.onRequest(request)
            let controller = ASAuthorizationController(authorizationRequests: [request])
            controller.delegate = self
            controller.presentationContextProvider = self
            controller.performRequests()
        }
        
        func presentationAnchor(for controller: ASAuthorizationController) -> ASPresentationAnchor {
            UIApplication.shared.windows.first { $0.isKeyWindow }!
        }
        
        func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization) {
            parent.onCompletion(.success(authorization))
        }
        
        func authorizationController(controller: ASAuthorizationController, didCompleteWithError error: Error) {
            parent.onCompletion(.failure(error))
        }
    }
}

// 原视图中替换使用即可
struct ContentView: View {
    var body: some View {
      VStack {
        AppleSignInButtonWrapper(
            onRequest: signInWithAppleOnRequest,
            onCompletion: signInWithAppleOnComplete
        )
        .frame(height: 50)
      }
      .ignoresSafeArea(.all)
    }
  
    func signInWithAppleOnRequest(request: ASAuthorizationAppleIDRequest) {
        request.requestedScopes = [.fullName, .email]
    }
  
    func signInWithAppleOnComplete(result: Result<ASAuthorization, Error>) {
        // 保留原有业务逻辑即可
    }
}

内容的提问来源于stack exchange，提问作者Yi-Hsiu Lee